Fatal error during Access Export

Symptoms

If you go to Toolset -> Export>/Import page and on the Access tab you start exporting Toolset Access settings it can happen that instead of a complete export you get a new tab with the message “The site is experiencing technical difficulties”.

This happens when in any Toolset Access Setting you remove a capability for a certain role over a certain content type, and you choose Toolset layout to be displayed to people with insufficient access rights. In such case, the export of the Access Settings will fail.

This issue occurs due to a Fatal Error that can be found in the logs:
PHP Fatal error: Uncaught Error: Class ‘Access_Admin_Edit’ not found in /types-access/legacy/includes/XML_Processor.php:79

Workaround

You can download this file, unzip it, then upload it to your wp-content/plugins/types-access/legacy/includes/ folder, replacing the existing XML_Processor.php file.